There are two types of AC/DC EMUs plying on Western Railway.
Conventional rakes converted from DC into AC/DC EMUs display 9xx numbers.
Newly built rakes at ICF display 3xx numbers.
Both are based on ICF chassis but the similarity ends there. Logic wise, they differ significantly from each other and many components are not interchangeable. More on it later.
Churchgate bound AC/DC EMU approaching Jogeshwari. This picture was snapped from Borivali bound slow train. Note two trailer coaches that have not received new livery, although they have been wired for AC/DC rake. The track on extreme right is an extension for passage to long distance passenger trains between Andheri and Borivali.
Brakes are applied as seen from position of master controller and brake cylinder gauge (0.8 kg/cm²). Since the rake is stationary, electronic logic selected EP (Electro-pneumatic) only application in first braking notch as regenerative braking is not available.
Slip/Slide detection is achieved by measuring wheel acceleration and/or the difference between each wheel speed and a reference speed for the vehicle.